Service Instructions Goodman® Brand GMEC96/GCEC96 & Amana® Brand AMEC96/ACEC96 Two Stage Furnace with multi-speed ECM Motor This manual is to be used by qualified, professionally trained HVAC technicians only. Goodman does not assume any responsibility for property damage or personal injury due to improper service procedures or services performed by an unqualified person. The material in this manual does not supercede manufacturers installation and operation instructions.
TABLE OF CONTENTS IMPORTANT INFORMATION ............................... 3 ACCESSORIES ................................................. 44 PRODUCT IDENTIFICATION .............................. 5 SERVICING TABLE OF CONTENTS..................48 FURNACE SPECIFICATIONS...............................9 SERVICING ........................................................ 49 OPERATION INSTRUCTIONS............................10 MAINTENANCE .................................................. 66 SYSTEM OPERATION.
IMPORTANT INFORMATION RISQUE D'EM POISONNEM ENT AU M ONOXYDE DE CARBONE Advertencia especial para la instalación de calentadores ó manejadoras de aire en áreas cerradas como estacionam ientos ó cuartos de servicio. Las em isiones de monóxido de carbono pueden circular a t ravés del aparat o cuando se opera en cualquier m odo. CO can cause serious illness including permanent brain dam age or deat h.
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PRODUCT IDENTIFICATION The model and manufacturing number are used for positive identification of component parts used in manufacturing. Please use these numbers when requesting service or parts information.
PRODUCT IDENTIFICATION M O D EL # M FG.
PRODUCT IDENTIFICATION M ODEL # M FG. # ACEC96 ACEC960403BNAA ACEC960603BNAA ACEC960803BNAA ACEC961005BNAA GCEC96 GCEC960403BNAA GCEC960603BNAA GCEC960803BNAA GCEC961005BNAA DESCRIPTION Amana ® Brand 96% Two Stage Heating / Two Stage Cooling Gas Furnace, Counter flow/Horizontal Left and Right, 34.5" tall, Induced Draft, Nidec multi-speed ECM motor. Stainless Steel tubular heat exchanger. 115 volt silicon nitride igniter. Left or right gas.
PRODUCT IDENTIFICATION MODEL # MFG # DESCRIPTION AFE18-60A N/A Fossil Fuel Kit. The AFE18-60A control is designed for use where the indoor coil is located above/downstream of a gas or fossil fuel furnace when used with a heat pump. It will operate with single and two stage heat pumps and single and two stage furnaces AMU1620 AMU1625 AMU2020 AMU2025 GMU1620 GMU1625 GMU2020 GMU2025 P1251305F P1251306F P1251307F Media Air Cleaner.
FURNACE SPECIFICATIONS * M EC96 * M EC96 * M EC96 * M EC96 * M EC96 * M EC96 * M EC96 * M EC96 * M EC96 * M EC96 * M EC96 0303ANA 0403ANA 0603ANA 0302BNA 0402BNA 0603BNA 0803BNA 1004CNA 1205DNA 0804CNA 1005CNA 30,000 28,800 21,000 20,160 96 20 - 50 2" - 3" 2 40,000 38,400 28,000 26,880 96 20 - 50 2" - 3" 2 60,000 57,600 42,000 40,320 96 30 - 60 2" - 3" 3 30,000 28,800 21,000 20,160 96 20 - 50 2" - 3" 2 40,000 38,400 28,000 26,880 96 20 - 50 2" - 3" 2 60,000 57,600 42,000 40,320 96
OPERATIONS INSTRUCTIONS Introduction This is a Category lV furnace. This furnace uses a pressurized venting system and must be installed per National and local codes requirements and the installation manual that was shipped with the furnace. The *MEC96 34.5" furnace is one of the products in our newly redesigned line of shorter chassis furnaces. It is available in the following sizes and suitable for up flow / horizontal installation.
SYSTEM OPERATION • WARNING TO PREVENT PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO FIRE, DO NOT INSTALL THIS FURNACE IN A MOBILE HOME, TRAILER, OR RECREATIONAL VEHICLE. To ensure proper furnace operation, install, operate, maintain and service the furnace in accordance with the installation, operation and service instructions, all local building codes and ordinances. In their absence, follow the latest edition of the National Fuel Gas Code (NFPA 54/ANSI Z223.
SYSTEM OPERATION • • • • hydrochloric acid cements and glues antistatic fabric softeners for clothes dryers and masonry acid washing materials Isolate a non-direct vent furnace if it is installed near an area frequently contaminated by any of the above substances. This protects the non-direct vent furnace from airborne contaminants. To ensure that the enclosed non-direct vent furnace has an adequate supply of combustion air, vent from a nearby uncontaminated room or from outdoors.
SYSTEM OPERATION Furnace Suspension If suspending the furnace from rafters or joist, use 3/8" threaded rod and 2”x2”x1/8” angle iron as shown in the following figure. If the furnace is installed in a crawl space it must also be suspended from the floor joist or supported by a concrete pad. Never install the furnace on the ground or allow it to be exposed to water. The length of rod will depend on the application and the clearances necessary.
SYSTEM OPERATION ensure there is an adequate supply of combustion and ventilation air for the other appliances. Refer to the latest edition of the National Fuel Gas Code NFPA 54/ANSI Z223.1 (Section 9.3), or CAN/CGA B149 Installation Codes (Sections 7.2, 7.3, or 7.4), or applicable provisions of the local building codes for determining the combustion air requirements for the appliances.
SYSTEM OPERATION 9.3.3.1 Two Permanent Openings Method. Two permanent openings, one commencing within 12 in. (300 mm) of the top and one commencing within 12 in. (300 mm) of the bottom, of the enclosure shall be provided.
SYSTEM OPERATION (c) The minimum size of outdoor opening(s) shall be the full size of outdoor opening(s) calculated in accordance with 9.3.3, multiplied by the reduction factor. The minimum dimension of air openings shall not be less than 3 in. (80 mm). 9.3.8.4 Ducts shall not serve both upper and lower combustion air openings where both such openings are used. The separation between ducts servicing upper and lower combustion air openings shall be maintained to the source of combustion air. 9.3.
SYSTEM OPERATION Insert f lange. Cut 2 ½” long. RF000142 Leveling Leveling ensures proper condensate drainage from the heat exchanger and induced draft blower. For proper flue pipe drainage, the furnace must be level lengthwise from end to end. The furnace should also be level from back to front or have a slight tilt with the access doors downhill (approximately 3/4") from the back panel.
SYSTEM OPERATION Freeze Protection If the drain trap and drain line will be exposed to temperatures near or below freezing, adequate measures must be taken to prevent condensate from freezing. NOTE: The use of insulation and/or heat tape is recommended. Failure to provide proper condensate drainage can result in property damage.
SYSTEM OPERATION • A vent termination shall not terminate over public walkways or over an area where condensate or vapor could create a nuisance or hazard or could be detrimental to the operation of regulators, relief valves, or other equipment. • The combustion air intake termination of a direct vent application should not terminate in an area which is frequently dusty or dirty. NOTE: In Canada, the B149 Fuel Gas Code takes precedence over the preceding termination restrictions.
SYSTEM OPERATION 10”- 24” TEE (OPTIONAL) 6” MAX COMBUSTION AIR INTAKE (OPTIONAL) 12” MIN HEIGHT DIFFERENCE BETWEEN INTAKE AND VENT *Not required for single pipe installation L OF RO INE 4” MIN 90º OR 45° ELBOW X. MA ” 96 IN. ”M 3 12" MIN. TO GRADE OR HIGHEST ANTICIPATED SNOW LEVEL 12” MIN TO ROOF OR HIGHEST ANTICIPATED SNOW LEVEL Standard Horizontal Terminations (Dual Pipe) ELBOWS 90° ELBOWS STRAIGHT 12" MIN.
SYSTEM OPERATION VENT/INTAKE TERMINATIONS FOR INSTALLATION OF MULTIPLE DIRECT VENT FURNACES If more than one direct vent furnace is to be installed vertically through a common roof top, maintain the same minimum clearances between the exhaust vent and air intake terminations of adjacent units as with the exhaust vent and air intake terminations of a single unit.
SYSTEM OPERATION Vent Combustion Air Maintain 12" (18" for Canada) minimum clearance above highest anticipated snow level. Maximum of 24" above roof. WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES OPERATING. Support (Field Supplied) 45 Elbow (Field Supplied) A condensing gas furnace achieves its high level of efficiency by extracting almost all of the heat from the products of combustion and cooling them to the point where condensation takes place.
SYSTEM OPERATION PROPANE GAS CONVERSION WARNING POSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR IF THE CORRECT CONVERSION KITS ARE NOT INSTALLED. THE APPROPRIATE KITS MUST BE APPLIED TO INSURE SAFE AND PROPER FURNACE OPERATION. ALL CONVERSIONS MUST BE PERFORMED BY A QUALIFIED INSTALLER OR SERVICE AGENCY. This unit is configured for natural gas. The appropriate manufacturer’s propane gas conversion kit, must be applied for propane gas installations.
SYSTEM OPERATION GAS PIPING CHECKS Before placing unit in operation, leak test the unit and gas connections. WARNING TO AVOID THE Complete information regarding tank sizing for vaporization, recommended regulator settings, and pipe sizing is available from most regulator manufacturers and propane gas suppliers. Refer to the following illustration for typical propane gas installations and piping. POSSIBLITY OF EXPLOSION OR FIRE, NEVER USE A MATCH OR OPEN FLAME TO TEST FOR LEAKS.
SYSTEM OPERATION WARNING IF THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED EXACTLY, A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE. – DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE. – WHAT TO DO IF YOU SMELL GAS: • DO NOT TRY TO LIGHT ANY APPLIANCE. • DO NOT TOUCH ANY ELECTRICAL SWITCH; DO NOT USE ANY PHONE IN YOUR BUILDING. • IMMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR’S PHONE.
SYSTEM OPERATION Use a separate fused branch electrical circuit containing properly sized wire, and fuse or circuit breaker. The fuse or circuit breaker must be sized in accordance with the maximum overcurrent protection specified on the unit rating plate. An electrical disconnect must be provided at the furnace location. NOTE: Line polarity must be observed when making field connections.
SYSTEM OPERATION TWINNING R Fur nace Int egrat ed Cont r ol Module R Y C Remot e Condensing Unit (Single-St age Cool ing) Thermostat - Two-Stage Heating with Single-Stage Cooling Y2 W1 W2 Y W1 W2 Fur nace Int egrat ed Cont rol Module Y2 Using the “TWIN” terminals and proper wiring enables two *MEC96 furnaces of the same model and size to be twinned.
SYSTEM OPERATION WARNING TO AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK, TURN OFF POW ER TO THE FURNACE BEFORE CHANGING SPEED TAPS. Circulator Blower Speed Facts 1. Motor speed Tap wiring must remain in factory position on the control board and motor. 2. There are 4 speed Tap wires to the motor T1, T2, T3, T4. 3. There are 5 speeds available, depending on DIP switch settings and found in air flow table for each size furnace. 4.
SYSTEM OPERATION DIP SWITCH SETTINGS PCBBF137 CONTROL BOARD DIP SWITCHES Thermostat Selection Switches 1 Heating Fan Off Delay 3 S1 2 DIP DIP Swi tch Swi tch Purpos e Group Number 4 Heating CFM Switches 1 S3 1 1, 2 Hea t Sta gi ng / Del a y 3, 4 Bl ower Hea t Off Del a y S1 2 2 Functi on Auto 10 Mi nutes 20 Mi nutes 2 Sta ge 90 Seconds 120 Seconds 150 Seconds 180 Seconds 1 OFF* 1 ON 1 ON 1 OFF 3 OFF 3 OFF 3 ON* 3 ON* 2 ON* 2 OFF 2 ON 2 OFF 4 OFF 4 ON 4 OFF* 4 ON * = Fa ctory Pos i ti o
SYSTEM OPERATION DIP SWITCH SETTINGS PCBBF137 PCBBF139 DIP Sw itches S2-1 S2-2 S2-3 DIP Sw itches S1-1 S1-2 S1-3 **OFF OFF OFF **OFF OFF OFF ON OFF OFF ON OFF OFF ON ON OFF / OFF ON ON ON ON OFF Tstat Call Ylo Y Ylo Y Ylo Y Ylo Y Ylo Y Ylo Y Ylo Y Ylo Y 0.1 CFM 0.2 CFM 0.3 CFM 0.4 CFM 0.5 CFM 0.6 CFM 0.7 CFM 0.
SYSTEM OPERATION DIP SWITCH SETTINGS PCBBF137 PCBBF139 DIP Sw itches S2-1 S2-2 S3-3 DIP Sw itches S1-1 S1-2 S1-3 **OFF OFF OFF **OFF OFF OFF ON OFF OFF ON OFF OFF ON ON OFF / OFF ON ON ON ON OFF OFF ON OFF^ OFF ON OFF^ OFF OFF ON OFF OFF ON NA OFF ON ON^ ON OFF ON *MEC960403AN - COOLING Static 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.
SYSTEM OPERATION DIP SWITCH SETTINGS PCBBF137 PCBBF139 DIP Sw itches S2-1 S2-2 S3-3 DIP Sw itches S1-1 S1-2 S1-3 **OFF OFF OFF **OFF OFF OFF ON OFF OFF ON OFF OFF ON ON OFF / OFF ON ON ON ON OFF OFF ON OFF^ OFF ON OFF^ OFF OFF ON OFF OFF ON NA OFF ON ON^ ON OFF ON ON OFF ON ON ON ON^ 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.
SYSTEM OPERATION DIP SWITCH SETTINGS PCBBF139 *CEC960403BN - COOLING DIP Switches S1-1 S1-2 S1-3 **OFF OFF OFF ON OFF OFF ON ON OFF OFF ON OFF^ OFF OFF ON^ OFF ON ON ON OFF ON ON ON ON^ Static 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.
SYSTEM OPERATION DIP SWITCH SETTINGS PCBBF137 PCBBF139 DIP Switches S2-1 S2-2 S2-3 DIP Switches S1-1 S1-2 S1-3 **OFF OFF OFF **OFF OFF OFF ON OFF OFF ON OFF OFF ON ON OFF / OFF ON ON ON ON OFF OFF ON OFF^ OFF ON OFF^ OFF OFF ON *CEC960603BN - COOLING Static 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.
SYSTEM OPERATION DIP SWITCH SETTINGS PCBBF137 PCBBF139 DIP Switches S2-1 S2-2 S2-3 DIP Switches S1-1 S1-2 S1-3 **OFF OFF OFF **OFF OFF OFF ON OFF OFF ON OFF OFF ON ON OFF / OFF ON ON ON ON OFF OFF ON OFF OFF ON OFF OFF OFF ON OFF OFF ON NA OFF ON ON ON OFF ON^ ON OFF ON^ ON ON ON^ ON ON ON^ PCBBF137 PCBBF139 DIP Switches DIP Switches S2-2 S2-3 S2-4 **EC960803BN - COOLING Static 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.
SYSTEM OPERATION DIP SWITCH SETTINGS PCBBF137 DIP Switches S2-1 S2-2 S2-3 DIP Switches S1-1 S1-2 S1-3 **OFF OFF OFF **OFF OFF OFF ON OFF OFF^ ON OFF OFF^ Static 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.
SYSTEM OPERATION DIP SWITCH SETTINGS PCBBF137 PCBBF139 DIP Switches S2-1 S2-2 S2-3 DIP Switches S1-1 S1-2 S1-3 **OFF OFF OFF **OFF OFF OFF ON OFF OFF^ ON OFF OFF^ ON ON OFF / OFF ON ON ON ON OFF OFF ON OFF OFF ON OFF OFF OFF ON OFF OFF ON NA OFF ON ON^ ON OFF ON^ ON OFF ON^ ON ON ON^ ON ON ON^ PCBBF137 PCBBF139 DIP Switches DIP Switches S2-2 S2-3 S2-4 *MEC961004CN - COOLING 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.
SYSTEM OPERATION DIP SWITCH SETTINGS PCBBF139 *CEC961005CN - COOLING DIP Switches S1-1 S1-2 S1-3 **OFF OFF OFF ON OFF OFF ON ON OFF OFF ON OFF^ OFF OFF ON OFF ON ON^ ON OFF ON Static 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.
SYSTEM OPERATION DIP SWITCH SETTINGS PCBBF137 DIP Switches S2-1 S2-2 S2-3 DIP Switches S1-1 S1-2 S1-3 **OFF OFF OFF **OFF OFF OFF ON OFF OFF^ ON OFF OFF^ ON ON OFF / OFF ON ON Static 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.
SYSTEM OPERATION DIP SWITCH SETTINGS PCBBF137 *MEC961205DN - COOLING PCBBF139 DIP Switches S2-1 S2-2 S2-3 DIP Switches S1-1 S1-2 S1-3 **OFF OFF OFF **OFF OFF OFF ON OFF OFF^ ON OFF OFF^ ON ON OFF / OFF ON ON ON ON OFF OFF ON OFF OFF ON OFF OFF OFF ON OFF OFF ON NA OFF ON ON^ ON OFF ON^ ON OFF ON^ ON ON ON^ ON ON ON^ PCBBF137 PCBBF139 DIP Switches DIP Switches S2-2 S2-3 S2-4 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.
SYSTEM OPERATION WARNING TO AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK, TURN OFF POW ER TO THE FURNACE BEFORE CHANGING SPEED TAPS. Circulator Blower Speed Facts 1. Motor speed Tap wiring must remain in factory position on the control board and motor. 2. There are 4 speed Tap wires to the motor T1, T2, T3, T4. Refer to Minimum Filter Area tables to determine filter area requirement. NOTE: Filters can also be installed elsewhere in the duct system such as a central return.
SYSTEM OPERATION CALL FOR 2ND STAGE AFTER FIRST STAGE: . · · · The inducer motor is enabled at high speed. The pressure switches are checked for closure. Closure of the second stage pressure switch will energize the high fire stage of the gas valve. The high speed circulator output is energized. NOTE: A call for 2nd stage without a call for 1st stage will be ignored, and a three amber flash code will be displayed on the LED. This error code will only be stored in memory once during a single power cycle.
SYSTEM OPERATION · · · · The circulator fan is energized at lo cool speed after a cool on delay. The electronic air cleaner will also be energized. After the thermostat is satisfied, the compressor is de-energized Following the 60 second Cool Mode Fan Off Delay period, the cool circulator and air cleaner relay are de-energized. When the call for “Ylo”and “G”are presented simultaneously, the control will honor the Cool On delay and keep the circulator de-energized.
ACCESSORIES DESCRIPTION MODEL NUMBER • • • • • • Concentric Side Wall Flush Mount Vent Kit (2") 0170K00001S • Concentric Vent Kit (2") DCVK-20 (CVENT-2) • Concentric Vent Kit (3") DCVK-30 (CVENT-3) • Propane Gas Conversion Kit LPM30 Propane Gas Conversion Kit LPM08 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
ACCESSORIES EXTERNAL FILTER RACK KIT ( EFR02 ) EFR01 EXTERNAL FILTER RACK KIT SLOTS IN FILTER CLEAR SCREWS ON UNIT Used on Models 90% Upflow Model Furnaces BLOWER DECK SCREWS UNIT SIDE PANEL FRONT OF UNIT FILTER RACK ASSEMBLY (FACE FILTER OPENING TOWARDS FRONT OF UNIT) BASE OF UNIT RETURN AIR CUTOUT AREA LOWER EDGE SCREW SIDE WALL VENT KIT (0170K00000S/0170K00001S) Description This side wall only vent kit #0170K00000S is to be used with 2” - 3” vent systems.
ACCESSORIES CONCENTRIC VENT CONVERSION KIT ( DCVK-20 DCVK-30 ) ( CVENT-2 ) ( CVENT-3 ) Vent The DCVK-20 (2") or the DCVK30 (3") is a concentric vent kit approved with furnaces listed in Combustion Air this manual. This concentric vent kit allows for Roof Boot/Flashing vertical or horizontal vent termination. The illustrations give a brief(Field Supplied) view of the kit and its application.
ACCESSORY WIRING DIAGRAMS HIGH VOLTAGE! DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
SERVICING SERVICE NUMBERS S-1 CHECKING VOLTAGE ................................................................................................................................. 55 S-2 CHECKING WIRING .................................................................................................................................... 55 S-3A S-3B THERMOSTAT AND WIRING .......................................................................................................................
SERVICING As more and more electronic's are introduced to the Heating Trade, Polarization of incoming power and phasing of primary to secondary voltage on transformers becomes more important. INCOMING POWER METER READS METER READS 120 VOLTS 0 VOLTS Polarization has been apparent in the Appliance industry since the introduction of the three prong plug, however, the Heating Industry does not use a plug for incoming power, but is hard wired.
SERVICING 1 1 CUBIC FEET One GAS RATE -- CUBIC FEET PER HOUR Size of Test Dial 5 cu/ft Seconds for One Revolution 1/4 cu/ft 1/2 cu/ft 1 cu/ft 2 cu/ft 5 cu/ft 720 1800 36 25 50 100 200 500 327 300 655 600 1636 1500 37 38 -23 -47 97 95 195 189 486 474 138 129 277 257 555 514 1385 1286 39 40 -22 -45 92 90 185 180 462 450 60 56 120 113 240 225 480 450 1200 1125 41 42 -21 -43 -86 176 172 439 429 53 106 212 424 1059 -- -- -- 167 419 50 47 100 95 200 18
SERVICING Power Failure Blown Fuse Loose Connection Shorted or Broken Wires No Low Voltage Faulty Thermostat Faulty Transformer Poor or High Resistance Ground • • • • • • • Faulty Ignition Control Gas Valve or Gas Supply Shut Off Faulty Induced Draft Blower Faulty Blower Motor (PSC) Broken or Shorted Ignitor Dirty Flame Sensor, Low UA Stuck Gas Valve Faulty Gas Valve Open Auxiliary Limit Improper Air Flow or Distribution Cycling on Limit Delayed Ignition • • • • • • • • • • • • • • • • • • • • • • •
TROUBLESHOOTING Symptoms Green Amber Red LED Code LED Code LED Code Fault Description Check Cautions •Furnace fails to operate •None •Control board LED is off •None •None •Defective disconnect switch •Determine cause and restore •Confirm electrically safe •defective door switch • No proper high and low volt power condition before 115 volt power •No 24 volt supply proceeding with repairs power •Furnace is waiting for a •Solid ON call •None •None •Furnace is not receiving a call •None Requir
TROUBLESHOOTING Symptoms Green Amber Red LED Code LED Code LED Code Fault Description Check Cautions •Temperature rise, duct static, •Confirm electrically safe gas pressure, burner alignment, condition before orifice plate position, wiring to proceeding with repairs all limits •None •Four repeating flashes •Open limit circuit, main limit, aux limit, or roll out switch •Furnace does not operate, five Red •None flashes on control board •None •Five repeating flashes •Control board fuse, •Limit
DIAGNOSTIC CHART Refer to the Troubleshooting Chart in the back of this manual for assistance in determining the source of unit operational problems. External Lockout A control lockout resulting from an external fault sensed by the control, such as an unsuccessful recycle or retry period, or a limit trip. Once in External Lockout, the control will shut down for a period of one hour before attempting another trial for ignition. Internal Lockout A failure internal to the control board.
SERVICING S-1 CHECKING VOLTAGE CHECKING THERMOSTAT, WIRING AND ANTICIPATOR WARNING HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR CHANGING ANY ELECTRICAL WIRING. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE S-3A THERMOSTAT AND WIRING WARNING DISCONNECT ALL POWER BEFORE SERVICING. PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. 1. Remove cover from the Junction Box and gain access to incoming power lines. With Power ON: WARNING LINE VOLTAGE NOW PRESENT 2.
SERVICING S-4 CHECKING TRANSFORMER AND Control CIRCUIT S-16A CHECKING AIR CIRCULATOR BLOWER MOTOR (MULTI-SPEED ECM MOTOR) A step-down transformer 120 volt primary to 24 volt secondary, 40 VA (Heating and Cooling Models) supplies ample capacity of power for either operation. WARNING DISCONNECT ALL POWER BEFORE SERVICING. WARNING HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR CHANGING ANY ELECTRICAL WIRING. MULTIPLE POWER SOURCES MAY BE PRESENT.
SERVICING To determine proper air movement, proceed as follows: 1. With clean filters in the furnace, use a draft gauge (inclined manometer) to measure the static pressure of the return duct at the inlet of the furnace. (Negative Pressure) 2. Measure the static pressure of the supply duct. (Positive Pressure) 3. Add the two (2) readings together for total external static pressure. NOTE: Both readings may be taken simultaneously and read directly on the manometer if so desired.
SERVICING PRIMARY LIMIT CONTROL Primary Limit Control Location (90% Upflow Furnace Shown) The following drawing illustrates the style of limit switches used on the 90% furnaces. If the limit circuit opens five times within a single call for heat, the furnace will go into lockout for one hour. The RED LED will display a FOUR flash code during this time. The control board can be reset by cycling 115 volt power to the furnace.
SERVICING AUXILIARY LIMIT CONTROL VOLT / OHM METER BLOWER HOUSING RED RESET BUTTON AUXILIARY LIMIT CONTROL Auxiliary Limit Control Location COLOR IDENTIFYING TAB Testing Auxiliary Limit Control WARNING HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. 1. Remove blower compartment door to gain access to the auxiliary. 2.
SERVICING 302 CHECKING FLAME ROLLOUT CONTROL 7. After check and/or replacement of rollout switch, rein- A temperature activated manual reset control is mounted to the manifold assembly as shown in the following illustration. stall burner compartment door and verify proper unit operation. S-303 INDUCED DRAFT BLOWER Motor FLAME ROLLOUT SWITCHES WARNING HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT.
SERVICING S-306 Two stage gas valves always require 24 volts between common and low fire (main coil) to open. Also, the furnace front cover pressure switch is wired in series with the low (main) solenoid of the gas valve. In the event of a non functioning gas valve, always check the front cover pressure switch. Also see section S-307 on Checking Gas Pressure and section S-310 on Checking Pressure Switches S-305 CHECKING MAIN BURNERS BURNERS Burners have been redesigned for 34.5" chassis furnaces.
SERVICING INLET OUTLET If supply pressure differs from table, make the necessary adjustments to pressure regulator, gas piping size, etc., and/or consult with local gas utility. 5. Turn OFF gas to furnace at the manual shutoff valve and disconnect manometer. Reinstall plug before turning on gas to furnace. 6. Turn OFF any unnecessary gas appliances stated in step 3.
SERVICING 6. Turn on power and close thermostat “R” and “W1” contacts to provide a call for low stage heat. Regulator Vent 7. Measure the gas manifold pressure with burners firing. Adjust manifold pressure using the Manifold Gas Pressure table shown below. 8. Remove regulator cover screw from the low (LO) outlet pressure regulator adjust tower and turn screw clockwise to increase pressure or counterclockwise to decrease pressure. Replace regulator cover screw. 9.
SERVICING e. Remove the 1/8" NPT hose barb fitting from the outlet pressure tap. Replace the outlet pressure boss plug and seal with a high quality thread sealer. WARNING HIGH VOLTAGE DISCONNECT ALL ELECTRICAL POWER AND SHUT OFF GAS SUPPLY BEFORE SERVICING OR INSTALLING. 2. Turn on gas to furnace and check for leaks. If leaks are found, repair and then reinstall burner compartment door. 3. Turn on electrical power and verify proper unit operation.
SERVICING INDUCED DRAFT BLOWER PRESSURE SWITCH PRESSURE SWITCH HOSE OPEN TO * * ATMOSPHERE * M 1 P 3 O F F * C S-313 CHECKING INTEGRATED IGNITION CONTROL BOARDS 2 ON * * 3. Carry over (lighter tube or cross lighter) obstructed - clean. 4. Main burner orifice(s) deformed, or out of alignment to burner - replace.
R781 R783 K8 E21 E20 E19 HUM E28 E18 XFM R E16 E17 L1 HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY ST2 RV2 DAMAGE, PERSONAL INJURY OR DEATH. R89 R88 R94 R95 R96 W 18 R97 R92 Flame current can be measured in two ways: 1. Putting a D.C.
MAINTENANCE WARNING HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. CAUTION IF YOU MUST HANDLE THE ITNITOR, HANDLE WITH CARE. T OUCHING THE IG NITOR BODY WITH BARE FINGERS, ROUG H HANDLING, OR VIBRATIO N COULD RESULT IN EARLY IGNITO R FAILURE. O NLY A Q UALIFIED SERVICER SHOULD EVER HANDLE THE IGNITO R.
MAINTENANCE CONDENSATE DRAINAGE SYSTEM (QUALIFIED SERVICER ONLY) The drain tubes, standpipe, and field supplied drain line must be checked annually and cleaned as often as necessary to ensure proper condensate drainage. FLAME SENSOR (QUALIFIED SERVICER ONLY) Under some conditions, the fuel or air supply can create a nearly invisible coating on the flame sensor. This coating acts as an insulator, causing a drop in the flame sensing signal.
MAINTENANCE A / GMEC96 Pressure Switch Trip Points And Usage Chart Coil Cover Model ID Blower Set Point on Max Make Pressure Low Fire Low Fire High Fire High Fire Low / High Pressure Fall Pressure On Switch Set Point on Max Make Set Point on Max Make Pressure Switch (PF) W.C. Rise W.C. Part # Pressure Fall Pressure On Pressure Fall Pressure On Assembly (PF) W.C. Rise W.C. (PF) W.C. Rise W.C. Part # *MEC960303ANAA - 0.08 ± .04 - 0.16 0130F00647 - 0.15 ± .05 - 0.30 - 0.
WIRING DIAGRAMS * M EC96 - REV AA YL HIGH FIRE PRESSURE SWITCH C NO NO L N WH DISCONNECT PU 2 CIRCUIT CONNECTOR RD WH HI 3 C 2 PU TO 115VAC/ 1 /60 HZ POWER SUPPLY WITH OVERCURRENT PROTECTION DEVICE OR BR FLAME SENSOR WARNING: DISCONNECT POWER BEFORE SERVICING. WIRING TO UNIT MUST BE PROPERLY POLARIZED AND GROUNDED.
* M EC96 - REV AB WIRING DIAGRAMS GN GRD YL OR PU GY HOT SURFACE IGNITER OR C HIGH FIRE PRESSURE SWITCH C NO NO L RD HI 3 PU WH C 2 DISCONNECT TO 115VAC/ 1Ø /60 HZ POWER SUPPLY WITH OVERCURRENT PROTECTION DEVICE GND L N WARNING: DISCONNECT POWER BEFORE SERVICING. WIRING TO UNIT MUST BE PROPERLY POLARIZED AND DISCONNECT GROUNDED.
WIRING DIAGRAMS * M EC96 - REV AC YL HIGH FIRE PRESSURE SWITCH C NO NO L RD HI 3 DISCONNECT WH TO 115VAC/ 1Ø /60 HZ POWER SUPPLY WITH OVERCURRENT PROTECTION DEVICE GND L N WARNING: DISCONNECT POWER BEFORE SERVICING. WIRING TO UNIT MUST BE PROPERLY POLARIZED AND DISCONNECT GROUNDED.
